{"id":"F2006B07773","name":"Airworthiness Directives 2004 - Revocation and Remaking - Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes","slug":"airworthiness-directives-2004-revocation-and-remaking-bombardier-boeing-canada-de-havilland-dhc-8-se","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50556,"registerId":"commonwealth-F2006B07773-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"Airworthiness Directives 2004 - Revocation and Remaking - Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes","content":"Airworthiness Directives 2004\n\nI, DAVID ALAN VILLIERS, delegate of the Civil Aviation Safety\n\nAuthority, acting under subregulation 39.001 (1) of the Civil\n\nAviation Safety Regulations 1998:\n\n(a) revoke the Airworthiness Directives mentioned in\n\nSchedule 1; and\n\n(b) make, as separate instruments, each Airworthiness\n\nDirective mentioned in Schedule 1 and attached.\n\n![](image.001.png)\n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority\n\n20 December 2004\n\nNote: Each attached Airworthiness Directive is being re-made in exactly the\n\nsame form as appears in the latest published edition of the Directive.\n\n  \nSchedule 1 Revocation and Remaking of\n\nAirworthiness Directives\n\nBombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes\n\nAD Name AD Number\n\nGround and Roll Control Spoilers AD/DHC-8/1\n\nElectronic Fuel Control Unit - CANCELLED AD/DHC-8/2\n\nPropeller Autofeather System AD/DHC-8/3\n\nElevator Control Quadrant Lever - CANCELLED AD/DHC-8/4\n\nFire Bottle Explosive Squib Wiring AD/DHC-8/5 Amdt 1\n\nMLG Uplock Actuator AD/DHC-8/6\n\nElectronic Engine Control Units AD/DHC-8/7 Amdt 1\n\nFlap Drive and Torque Sensing Systems AD/DHC-8/8 Amdt 4\n\nFlap Track No.5 Fail Safe Straps AD/DHC-8/9\n\nUncommanded Engine Power Roll Back AD/DHC-8/10\n\nEngine Cowl Door Retention and Pressure Relief AD/DHC-8/11 Amdt 1\n\nEmergency Lighting AD/DHC-8/12 Amdt 1\n\nLanding Gear Control System AD/DHC-8/13\n\nOxygen Line Chafing AD/DHC-8/14\n\nMLG Actuator Support Bracket and Bolts AD/DHC-8/15 Amdt 3\n\nEngine Bleed Air AD/DHC-8/16 Amdt 1\n\nFlap Ballscrews AD/DHC-8/17\n\nElevator Control Quadrant Lever AD/DHC-8/18\n\nBrake Pressure Line AD/DHC-8/19\n\nMicrowave Landing System Wiring AD/DHC-8/20\n\nEngine Rear Mount Strut AD/DHC-8/21 Amdt 1\n\nBulkhead Smoke Seal AD/DHC-8/22 Amdt 1\n\nNLG Upper Drag Strut Trunnion Fittings AD/DHC-8/23 Amdt 3\n\nFuel Heater Low Fuel Pressure Switch Adapter/Snubber and Engine Nacelle AD/DHC-8/24\n\nPower Cable Connectors AD/DHC-8/25\n\nHorizontal Stabiliser Attachment Bolts AD/DHC-8/26 Amdt 1\n\nPassenger Service Units Printed Circuit Boards AD/DHC-8/27 Amdt 1\n\nUnderwing Fairing Angles AD/DHC-8/28 Amdt 1\n\nAnti-Collision Strobe Light Power Supplies AD/DHC-8/29\n\n  \nNose Wheel Steering Potentiometer Lever Stop AD/DHC-8/30\n\nFirewall Electrical Terminal Block AD/DHC-8/31\n\nLanding Gear Hydraulic Selector Valve AD/DHC-8/32\n\nElectronic Engine Control Cable Harness Lightning Protection AD/DHC-8/33\n\nBlack Thermal Insulation AD/DHC-8/34 Amdt 1\n\nEngine Nacelle AD/DHC-8/35 Amdt 1\n\nElectrical Power - Battery Temperature Monitor AD/DHC-8/36\n\nFuselage Skin and Frames at Floor Level AD/DHC-8/37 Amdt 1\n\nACM Delivery and Recirculation Duct Thermal Insulation AD/DHC-8/38\n\nOutboard Flaps Front Spar and Top Skin Fasteners AD/DHC-8/39 Amdt 1\n\nBlack Thermal Insulation Retrofit Kits AD/DHC-8/40\n\nStall Warning System Computer AD/DHC-8/41\n\nDoor Labels AD/DHC-8/42\n\nNLG Drag Strut Pivot Tube AD/DHC-8/43\n\nRefuel/Defuel Tube Assembly AD/DHC-8/44\n\nPassenger Compartment Lighting Wiring AD/DHC-8/45 Amdt 1\n\nCockpit Door Alternate Release AD/DHC-8/46 Amdt 3\n\nEngine Compartment Hydraulic System AD/DHC-8/47 Amdt 1\n\nProvision of Separate Instrument Grounds AD/DHC-8/48 Amdt 2\n\nInspection of Wiring Harness AD/DHC-8/49\n\nDitching Dam Inflation Bottle AD/DHC-8/50 Amdt 1\n\nHorizontal Stabiliser Skin Disbonding AD/DHC-8/51\n\nBrake Valve Shuttle Valve Inspection AD/DHC-8/52\n\nRoll Disconnect System AD/DHC-8/53\n\nFuselage Cable Trough AD/DHC-8/54 Amdt 2\n\nHorizontal Stabiliser Skin Disbonding Follow-up AD/DHC-8/55\n\nMain Landing Gear Uplock Actuator Modification AD/DHC-8/56\n\nEmergency Lights AD/DHC-8/57\n\nLadder Plate at Wing Station 139 AD/DHC-8/58\n\nBonded Skin Panel Integrity AD/DHC-8/59\n\nWeight and Balance AD/DHC-8/60 Amdt 1\n\nRudder Feel Assembly Springs AD/DHC-8/61\n\nFlap Carriage Hook Roller Shafts AD/DHC-8/62 Amdt 2\n\nHorizontal Stabiliser Skin Disbonding Follow-Up - 2 AD/DHC-8/63 Amdt 2\n\nWing Fuel Tanks - Access Panel Sealing AD/DHC-8/64\n\nThunderstorm Lights AD/DHC-8/65\n\n  \nIn-Flight Selection of Ground Beta AD/DHC-8/66\n\nMain Landing Gear - Visual Leak Check AD/DHC-8/67\n\nBeta Backup Test Switches AD/DHC-8/68\n\nWing/Fuselage Closing Angles AD/DHC-8/69\n\nFuel Tank Vent and Scavenge Line Couplings AD/DHC-8/70\n\nInternal Baggage Compartment Door AD/DHC-8/71\n\nFlight Deck Structural Angle P/N 85310497-101/103 AD/DHC-8/72\n\nAirstair Door AD/DHC-8/73 Amdt 1\n\nOxygen - Deletion of Selector Stop on Flow Control Valve AD/DHC-8/74\n\nCabin Exhaust Foam Air Filters AD/DHC-8/75\n\nElectrical Arcing and High Pressure Fuel Line AD/DHC-8/76\n\nRudder Pedal Mechanism AD/DHC-8/77\n\nElevator Stop Bumper AD/DHC-8/78 Amdt 1\n\nWardrobe Shelf AD/DHC-8/79\n\nObserver Seat Latch AD/DHC-8/80\n\nPCU Oil Pump AD/DHC-8/81\n\nAutopilot Servo Engagement AD/DHC-8/82\n\nMode S Transponder Wiring AD/DHC-8/83\n\nAngle of Attack Sensor AD/DHC-8/84\n\nFuselage to Wing Rear Spar Fittings AD/DHC-8/85\n\nWing De-icing Boot Patch Limits AD/DHC-8/86\n\nOverhead Bins Electrical Connectors AD/DHC-8/87\n\nFlap Drive Actuator - Inspection AD/DHC-8/88 Amdt 1\n\nAileron Tab Actuator Arms AD/DHC-8/89\n\nFuel Vent and Scavenge Line Fittings - Inspection AD/DHC-8/90\n\nEmergency Exit Door Valve - Replacement AD/DHC-8/91\n\nRDS86 Weather Radar Circuit Breakers AD/DHC-8/92\n\nAPU Fuel Line Chafing AD/DHC-8/93\n\nPitot Static System AD/DHC-8/94\n\nAPU Fuel Line Chafing - CANCELLED AD/DHC-8/95\n\nBrake Hydraulic System AD/DHC-8/96\n\nControl Column Torque Tube AD/DHC-8/97\n\nEngine Oil Coolers AD/DHC-8/98 Amdt 1\n\nFuselage Longitudinal Skin Joints AD/DHC-8/99","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The instrument does not broaden or narrow the technical obligations imposed by the listed Airworthiness Directives. It revokes existing AD instruments and re-issues them as separate instruments in the same substantive form (per the Note). Therefore the practical regulatory scope—what operators must do to comply with safety directives—remains the same. The change is administrative (legal form and citation of instruments), not substantive. Operators should, however, confirm the status of items marked 'CANCELLED' and update records to reflect the new instrument citations."},"complexity_factors":["Relatively short primary instrument with a single operative clause (revoke and remake) but large schedule listing many ADs (around 100 entries up to AD/DHC-8/99).","Multiple AD entries show amendments (e.g. 'Amdt 1', 'Amdt 2', 'Amdt 3'), increasing the number of historical variants an operator may need to reconcile.","Some schedule entries are marked 'CANCELLED', creating possible ambiguity about which items are to be re-made versus simply noted for completeness.","Cross-reference to an enabling regulation (CASR subregulation 39.001(1)) — limited legal cross-referencing but important for authority and potential interpretation.","Attachments (re-made ADs) are referenced and said to be in the 'latest published edition' — operators must consult those attached documents, adding practical complexity.","Administrative complexity for compliance systems and record-keeping (updating citations and audit trails) despite no substantive regulatory change."],"plain_english_summary":"**What this instrument does (mechanically)\n\n- The Civil Aviation Safety Authority (CASA) delegate revokes a long list of existing Airworthiness Directives (ADs) that apply to Bombardier (Boeing Canada/De Havilland) DHC-8 series aeroplanes, and re-issues (re-makes) each one as a separate legal instrument. The delegate acts under subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998.  \n- The instrument explicitly lists the ADs being revoked and re-made in Schedule 1. The Note says each re-made AD is issued in exactly the same form as the latest published edition of that Directive.\n\n**Who this affects\n\n- Aircraft owners and operators of DHC-8 series aeroplanes registered or operated under Australian aviation rules.  \n- Maintenance organisations, approved maintenance engineers, and parts suppliers that carry out or certify work required by the listed ADs.  \n- CASA as the regulator, because the administrative form and citation of each AD will change (each becomes a separate instrument).\n\n**Why it matters (stated purpose and immediate legal effect)\n\n- Stated purpose: to replace the existing group of ADs with individually issued AD instruments while leaving their substantive content unchanged (each AD is re-made in the same form as the latest published edition).  \n- Immediate legal effect: the previous AD instruments listed in Schedule 1 are revoked; each AD in the Schedule is now a separate, stand-alone instrument. Obligations on operators to comply with those ADs continue (since the ADs are reissued in the same form) but will be enforced under the new instrument citations.\n\n**Practical consequences, costs and decision paths\n\n- Who pays: aircraft operators and maintenance organisations bear compliance costs for inspections, modifications, replacements or record-keeping specified by the listed ADs. Those obligations existed before and, according to the instrument, remain substantively the same.  \n- Who decides: a CASA delegate has executed the administrative change; the delegate’s legal authority comes from CASR subregulation 39.001(1).  \n- Behaviour changes required: operators must continue to comply with the technical requirements of each AD, but will need to reference and record compliance against the new individual AD instruments and their citations rather than the prior consolidated form.  \n\n**Administrative and implementation considerations (risks and trade-offs)\n\n- Administrative effect only: because the ADs are re-made in the same form, there is no intended substantive change to safety obligations. The primary change is administrative—separate legal instruments replace whatever previous format was used.  \n- Record-keeping and reference costs: operators and maintainers must ensure their manuals, compliance logs and maintenance records cite the correct new instrument numbers and dates. That creates a modest one-off administrative burden.  \n- Ambiguities to monitor: Schedule 1 includes entries marked \"CANCELLED\". It is not explicit in the revocation clause whether those items are being revoked as existing cancelled ADs, or whether they are excluded from re-issue; the Note suggests only attached ADs are re-made in the same form. Operators should check the attached instruments and CASA’s publications to confirm the current status of any item marked \"CANCELLED.\"  \n- Enforcement and legal certainty: because ADs are mandatory, changing their form can affect how compliance is evidenced in audits or enforcement actions. If the re-made instruments differ in citation, practitioners should confirm transitional arrangements (if any) from CASA.\n\n**Market and incentive lens (concise)\n\n- Competition and private choice: the measure does not change technical requirements that affect aircraft performance or maintenance standards; it therefore does not alter competitive conditions between carriers or maintenance providers beyond the administrative tasks of updating records and citations.  \n- Concentrated vs diffuse effects: benefits of clarity or modernised administrative form accrue to the regulator and legal users; costs (administrative updating, potential search for current instrument versions) are dispersed across many operators and maintenance organisations.  \n- Opportunity costs: staff time spent updating documentation and checking re-issued ADs is the main measurable cost. There is no stated transfer of funds or subsidy.\n\n**Bottom line**: This instrument is an administrative republishing: CASA (through a delegate) revokes the listed DHC-8 ADs and re-issues them as individual instruments in the same substantive form. Operators must continue to meet the same technical obligations but should verify and update references, records and compliance evidence to the newly issued AD instruments (and check the status of any items labelled \"CANCELLED\")."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a pure administrative remaking instrument with no expansion of scope. The note explicitly states each AD is being re-made 'in exactly the same form as appears in the latest published edition of the Directive.' The scope remains precisely limited to the DHC-8 aircraft series and the specific safety issues already identified in the existing ADs."},"complexity_factors":["Simple, standardised structure: single operative clause with two sub-paragraphs (revocation and remaking)","No defined terms section - relies on external definitions in the Civil Aviation Safety Regulations 1998","No conditional logic or nested exceptions in the instrument itself","Content is essentially a table of contents (Schedule 1) referencing 99 separate documents that are attached but not reproduced in full","Cross-references are limited to: (a) the enabling regulation (subregulation 39.001(1)), and (b) the attached ADs themselves","Straightforward administrative mechanism with no substantive policy changes"],"plain_english_summary":"This instrument revokes and reissues 99 existing Airworthiness Directives for Bombardier DHC‑8 (Dash 8) aeroplanes, effectively remaking them in the same form to restore legal validity. It’s a procedural housekeeping step that preserves existing safety obligations without changing technical content.\n\nIt affects operators, maintenance organisations and CASA oversight, ensuring continuity of legally binding inspection, repair and modification requirements that protect flight safety for the DHC‑8 fleet."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-bombardier-boeing-canada-de-havilland-dhc-8-se","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-bombardier-boeing-canada-de-havilland-dhc-8-se/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-bombardier-boeing-canada-de-havilland-dhc-8-se/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-bombardier-boeing-canada-de-havilland-dhc-8-se/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-bombardier-boeing-canada-de-havilland-dhc-8-se/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-bombardier-boeing-canada-de-havilland-dhc-8-se/documents"}}